Portable vacuum cleaner



FIG. 1 is a perspective view of a vacuum cleaner, showing our new design;

FIG. 2 is a rear elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a side elevational view; and

FIG. 6 is a bottom plan view. 

The ornamental design for a portable vacuum cleaner, substantially as shown and described. 